| somewhat biased because the 0w grade only comes in a synthetic where as the 5w and 10w grades are available in synthetic as well as non synthetic. Regardless the viscosity at the elevated temps are essentially the same for the 30w blend as specified by API standards for syn and non syn engine oils. Some examples of viscosity per Mobil tests indicate essentially the same viscosity at the highest posted temp at 100C (212F): Mobil 0w-30 syn vis at 100C is 10.6 cSt (see spec below) [ http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil_1_0W-30_Advanced_Fuel_Economy.aspx ] Mobil 10w-30 syn vis at 100C is 10.7 cSt (spec below) [ http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil_1_10W-30.aspx ] Mobil Super Non synthetic 10w-30 vis at 100C is 10.7 cSt(spec below) [ http://www.mobil.us/USA-English-LCW/carengineoils_products_mobil-super.aspx# ] Engine Oils with a xxW-30 viscosity rating, either synthetic or non synthetic, offer the same lube ability to reduce metal to metal contact with the same pumped oil pressure.
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